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Zhang J, Huang Y, Hu Y, Bai B. Compound heterozygous mutations in three Chinese patients of Segawa syndrome and their treatment outcomes. Int J Dev Neurosci 2024; 84:305-313. [PMID: 38566307 DOI: 10.1002/jdn.10328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 02/15/2024] [Accepted: 03/07/2024] [Indexed: 04/04/2024] Open
Abstract
Segawa syndrome is a rare autosomal recessive form of dopa-responsive dystonia resulting from TH gene dysfunction. Patients typically exhibit symptoms such as generalized dystonia, rigidity, tremors, infantile Parkinsonism, and pseudo-spastic paraplegia. Levodopa is often an effective treatment. Due to its rarity, high heterogeneity, and poorly understood pathological mutation and phenotype spectrums, as well as genotype-phenotype and genotype-treatment outcome correlations, Segawa syndrome poses diagnostic and therapeutic challenges. In our study, through clinical and molecular analyses of three Chinese Segawa patients, we re-evaluated the pathogenicity of a TH mutation (c.880G>C;p.G294R) previously categorized as "Conflicting classifications of pathogenicity" in ClinVar. Also, we summarized the clinical phenotypes of all reported Segawa syndrome cases until 2023 and compared them with our patients. We identified a novel phenotype, "cafe-au-lait macules," not previously observed in Segawa patients. Additionally, we discussed the correlation between specific genotypes and phenotypes, as well as genotypes and treatment outcomes of our three cases. Our findings aim to enhance the understanding of Segawa syndrome, contributing to improved diagnosis and treatment approaches in the future.
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Affiliation(s)
- Jie Zhang
- State Key Laboratory of Primate Biomedical Research, Kunming University of Science and Technology, Kunming, China
- Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
- Yunnan Key Laboratory of Primate Biomedical Research, Kunming, China
- Department of Medical Genetics, Yunnan Provincial Key Laboratory for Birth Defects and Genetic Diseases, National Health Commission Key Laboratory of Preconception Health Birth in Western China, The First People's Hospital of Yunnan Province, Kunming, China
- Department of Pediatrics, The First People's Hospital of Yunnan Province, Kunming, China
- Medical school, Kunming University of Science and Technology, The First People's Hospital of Yunnan Province, Kunming, China
| | - Yaxin Huang
- Department of Medical Genetics, Yunnan Provincial Key Laboratory for Birth Defects and Genetic Diseases, National Health Commission Key Laboratory of Preconception Health Birth in Western China, The First People's Hospital of Yunnan Province, Kunming, China
- Department of Pediatrics, The First People's Hospital of Yunnan Province, Kunming, China
- Medical school, Kunming University of Science and Technology, The First People's Hospital of Yunnan Province, Kunming, China
| | - Yulei Hu
- Department of Pediatrics, The First People's Hospital of Yunnan Province, Kunming, China
| | - Bing Bai
- State Key Laboratory of Primate Biomedical Research, Kunming University of Science and Technology, Kunming, China
- Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
- Yunnan Key Laboratory of Primate Biomedical Research, Kunming, China
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2
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Molnár Z, Koplányi G, Farkas R, Péli N, Kenéz B, Decsi B, Katona G, Balogh GT, Vértessy BG, Balogh-Weiser D. Immobilization of human tyrosine hydroxylase onto magnetic nanoparticles - A novel formulation of a therapeutic enzyme. Int J Biol Macromol 2024; 268:131939. [PMID: 38692555 DOI: 10.1016/j.ijbiomac.2024.131939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 04/17/2024] [Accepted: 04/26/2024] [Indexed: 05/03/2024]
Abstract
Human tyrosine hydroxylase (hTH) has key role in the production of catecholamine neurotransmitters. The structure, function and regulation of hTH has been extensively researched area and the possibility of enzyme replacement therapy (ERT) involving hTH through nanocarriers has been raised as well. However, our understanding on how hTH may interact with nanocarriers is still lacking. In this work, we attempted to investigate the immobilization of hTH on magnetic nanoparticles (MNPs) with various surface linkers in quantitative and mechanistic detail. Our results showed that the activity of hTH was retained after immobilization via secondary and covalent interactions as well. The colloidal stability of hTH could be also enhanced proved by Dynamic light scattering and Zeta potential analysis and a homogenous enzyme layer could be achieved, which was investigated by Raman mapping. The covalent attachment of hTH on MNPs via aldehyde or epoxy linkers provide irreversible immobilization and 38.1 % and 16.5 % recovery (ER). The hTH-MNPs catalyst had 25 % ER in average in simulated nasal electrolyte solution (SNES). This outcome highlights the relevance of immobilization applying MNPs as a potential formulation tool of sensitive therapeutic enzymes offering new opportunities for ERT related to neurodegenerative disorders.
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Affiliation(s)
- Zsófia Molnár
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary; Institue of Enzymology, Research Center of Natural Science, Eötvös Loránd Research Network, Magyar tudósok körútja 2., H-1117 Budapest, Hungary
| | - Gábor Koplányi
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Réka Farkas
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Noémi Péli
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Balázs Kenéz
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Balázs Decsi
- Department of Chemical and Environmental Process Engineering, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Gábor Katona
- Institute of Pharmaceutical Technology and Regulatory Affairs, Faculty of Pharmacy, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary
| | - György T Balogh
- Department of Chemical and Environmental Process Engineering, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary; Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes E. Street 7-9, H-1092 Budapest, Hungary
| | - Beáta G Vértessy
- Institue of Enzymology, Research Center of Natural Science, Eötvös Loránd Research Network, Magyar tudósok körútja 2., H-1117 Budapest, Hungary; Department Applied Biotechnology and Food Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Diána Balogh-Weiser
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary; Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary.
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3
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Szigetvari PD, Patil S, Birkeland E, Kleppe R, Haavik J. The effects of phenylalanine and tyrosine levels on dopamine production in rat PC12 cells. Implications for treatment of phenylketonuria, tyrosinemia type 1 and comorbid neurodevelopmental disorders. Neurochem Int 2023; 171:105629. [PMID: 37865339 DOI: 10.1016/j.neuint.2023.105629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 10/11/2023] [Accepted: 10/13/2023] [Indexed: 10/23/2023]
Abstract
Phenylketonuria (PKU) is an autosomal recessive metabolic disorder caused by mutations in the phenylalanine hydroxylase (PAH) gene, resulting in phenylalanine accumulation and impaired tyrosine production. In Tyrosinemia type 1 (TYRSN1) mutations affect fumarylacetoacetate hydrolase, leading to accumulation of toxic intermediates of tyrosine catabolism. Treatment of TYRSN1 with nitisinone results in extreme tissue levels of tyrosine. Although PKU and TYRSN1 have opposite effects on tyrosine levels, both conditions have been associated with neuro-psychiatric symptoms typically present in ADHD, possibly indicating an impaired dopamine (DA) synthesis. However, concrete in vivo data on the possible molecular basis for disrupted DA production under disease mimicking conditions have been lacking. In pursuit to uncover associated molecular mechanisms, we exposed an established, DA producing cell line (PC12) to different concentrations of phenylalanine and tyrosine in culture media. We measured the effects on viability, proteomic composition, tyrosine, DA and tyrosine hydroxylase (TH) levels and TH phosphorylation. TH catalyzes the rate-limiting step in DA synthesis. High extracellular levels of phenylalanine depleted cells of intracellular tyrosine and DA. Compared to physiological levels (75 μM), either low (35 μM) or high concentrations of tyrosine (275 or 835 μM) decreased cellular DA, TH protein, and its phosphorylation levels. Using deep proteomic analysis, we identified multiple proteins, biological processes and pathways that were altered, including enzymes and transporters involved in amino acid metabolism. Using this information and published data, we developed a mathematical model to predict how extracellular levels of aromatic amino acids can affect the cellular synthesis of DA via different mechanisms. Together, these data provide new information about the normal regulation of neurotransmitter synthesis and how this may be altered in neurometabolic disorders, such as PKU and TYRSN1, with implications for the treatment of cognitive symptoms resulting from comorbid neurodevelopmental disorders.
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Affiliation(s)
| | - Sudarshan Patil
- Department of Biomedicine, University of Bergen, 5009, Bergen, Norway.
| | - Even Birkeland
- Department of Genetic Research & Bioinformatics, Norwegian Institute of Public Health, Bergen, Norway; The Proteomics Facility of the University of Bergen (PROBE), University of Bergen, Bergen, Norway
| | - Rune Kleppe
- Norwegian Centre for Maritime- and Diving Medicine, Department of Occupational Medicine, Haukeland University Hospital, 5021, Bergen, Norway.
| | - Jan Haavik
- Department of Biomedicine, University of Bergen, 5009, Bergen, Norway; Bergen Center of Brain Plasticity, Division of Psychiatry, Haukeland University Hospital, Norway.
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4
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Yoshimatsu S, Okahara J, Yoshie J, Igarashi Y, Nakajima R, Sanosaka T, Qian E, Sato T, Kobayashi H, Morimoto S, Kishi N, Pillis DM, Malik P, Noce T, Okano H. Generation of a tyrosine hydroxylase-2A-Cre knockin non-human primate model by homology-directed-repair-biased CRISPR genome editing. CELL REPORTS METHODS 2023; 3:100590. [PMID: 37714158 PMCID: PMC10545943 DOI: 10.1016/j.crmeth.2023.100590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 06/29/2023] [Accepted: 08/22/2023] [Indexed: 09/17/2023]
Abstract
Non-human primates (NHPs) are the closest animal model to humans; thus, gene engineering technology in these species holds great promise for the elucidation of higher brain functions and human disease models. Knockin (KI) gene targeting is a versatile approach to modify gene(s) of interest; however, it generally suffers from the low efficiency of homology-directed repair (HDR) in mammalian cells, especially in non-expressed gene loci. In the current study, we generated a tyrosine hydroxylase (TH)-2A-Cre KI model of the common marmoset monkey (marmoset; Callithrix jacchus) using an HDR-biased CRISPR-Cas9 genome editing approach using Cas9-DN1S and RAD51. This model should enable labeling and modification of a specific neuronal lineage using the Cre-loxP system. Collectively, the current study paves the way for versatile gene engineering in NHPs, which may be a significant step toward further biomedical and preclinical applications.
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Affiliation(s)
- Sho Yoshimatsu
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan; Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Junko Okahara
- Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan; Central Institute for Experimental Animals, Kawasaki City, Kanagawa 210-0821, Japan.
| | - Junko Yoshie
- Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Yoko Igarashi
- Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Ryusuke Nakajima
- Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Tsukasa Sanosaka
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Emi Qian
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Tsukika Sato
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan; Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Hiroya Kobayashi
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Satoru Morimoto
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Noriyuki Kishi
- Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Devin M Pillis
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute (CBDI), Cincinnati Children's Hospital Medical Center (CCHMC), Cincinnati, OH 45229, USA
| | - Punam Malik
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute (CBDI), Cincinnati Children's Hospital Medical Center (CCHMC), Cincinnati, OH 45229, USA; Division of Hematology, CBDI, CCHMC, Cincinnati, OH 45229, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA
| | - Toshiaki Noce
- Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan
| | - Hideyuki Okano
- Department of Physiology, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan; Laboratory for Marmoset Neural Architecture, RIKEN Center for Brain Science, Wako City, Saitama 351-0198, Japan.
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5
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Reyes ZMD, Lynch E, Henry J, De Simone LM, Sobotka SA. Diagnosis of autism in a rare case of tyrosine hydroxylase deficiency: a case report. BMC Med Genomics 2023; 16:78. [PMID: 37041529 PMCID: PMC10088295 DOI: 10.1186/s12920-023-01510-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 04/04/2023] [Indexed: 04/13/2023] Open
Abstract
BACKGROUND Tyrosine hydroxylase deficiency (THD) is a rare movement disorder with broad phenotypic expression caused by bi-allelic mutations in the TH gene, which encode for tyrosine hydroxylase (TH) protein. Some patients with THD have improvement in dystonia with carbidopa-levodopa, a synthetic form of dopamine typically used in Parkinson's disease, and are considered to have dopa-responsive THD. THD has been found in 0.5-1 per million persons, although due to overlapping symptoms with other disorders and the need for genetic testing, prevalence is likely underestimated. Existing literature describes some patients with THD having intellectual disability, but comorbid autism spectrum disorder (ASD) has not been reported. CASE PRESENTATION A nearly 3-year-old boy was referred to pediatric neurology due to hypotonia, delayed motor milestones, and expressive speech delay. Whole exome sequencing confirmed tyrosine hydroxylase deficiency, detecting a novel variant p.S307C first reported here. The child was treated with carbidopa-levodopa with an excellent response, resulting in improved balance, fewer falls, and improved ability to jump, run and climb stairs. He was determined to have dopa-responsive THD. Due to his delays in expressive speech, the boy also had an assessment with a developmental and behavioral pediatrician, who identified a pattern of social pragmatic speech delay, sensory sensitivities, and restricted interests, and determined that he met criteria for a diagnosis of ASD. CONCLUSIONS While ASD can stand alone as a clinical diagnosis, it is also a cardinal feature of other genetically-based neurological disorders. To our knowledge, this is the first case that describes a patient with both disorders. Perhaps THD may be among the genetic disorders linked with ASD.
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Affiliation(s)
| | - Emma Lynch
- Section of Developmental and Behavioral Pediatrics, Department of Pediatrics, The University of Chicago, 950 East 61St Street, Suite 207, Chicago, IL, 60637, USA
| | - Julia Henry
- Section of Pediatric Neurology, Department of Pediatrics, The University of Chicago, Chicago, USA
| | | | - Sarah A Sobotka
- Section of Developmental and Behavioral Pediatrics, Department of Pediatrics, The University of Chicago, 950 East 61St Street, Suite 207, Chicago, IL, 60637, USA.
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Li ZD, Li H, Kang S, Cui YG, Zheng H, Wang P, Han K, Yu P, Chang YZ. The divergent effects of astrocyte ceruloplasmin on learning and memory function in young and old mice. Cell Death Dis 2022; 13:1006. [PMID: 36443285 PMCID: PMC9705310 DOI: 10.1038/s41419-022-05459-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 11/16/2022] [Accepted: 11/18/2022] [Indexed: 11/29/2022]
Abstract
Ceruloplasmin (CP) plays an important role in maintaining iron homeostasis. Cp gene knockout (Cp-/-) mice develop a neurodegenerative disease with aging and show iron accumulation in the brain. However, iron deficiency has also been observed in 3 M Cp-/- mice. The use of systemic Cp gene knockout is insufficient to reveal specific functions for CP in the central nervous system. Considering recent discoveries that astrocytes synthetize the majority of brain CP, we generated astrocyte conditional Cp knockout (CpGfapcKO) mice, and found that iron contents decreased in the cerebral cortex and hippocampus of young (6 M) and old (18 M) CpGfapcKO mice. Further experiments revealed that 6 M CpGfapcKO mice exhibited impaired learning and memory function, while 18 M CpGfapcKO mice exhibited improved learning and memory function. Our study demonstrates that astrocytic Cp deletion blocks brain iron influx through the blood-brain-barrier, with concomitantly increased iron levels in brain microvascular endothelial cells, resulting in brain iron deficiency and down-regulation of ferritin levels in neurons, astrocytes, microglia and oligodendrocytes. At the young age, the synapse density, synapse-related protein levels, 5-hydroxytryptamine and norepinephrine, hippocampal neurogenesis and myelin formation were all decreased in CpGfapcKO mice. These changes affected learning and memory impairment in young CpGfapcKO mice. In old CpGfapcKO mice, iron accumulation with aging was attenuated, and was accompanied by the alleviation of the ROS-MAPK-apoptosis pathway, Tau phosphorylation and β-amyloid aggregation, thus delaying age-related memory decline. Overall, our results demonstrate that astrocytic Cp deletion has divergent effects on learning and memory function via different regulatory mechanisms induced by decreased iron contents in the brain of mice, which may present strategies for the prevention and treatment of dementia.
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Affiliation(s)
- Zhong-Da Li
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Haiyan Li
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China ,grid.413851.a0000 0000 8977 8425College of Basic Medicine, Chengde Medical University, Chengde, Hebei Province China
| | - Shaomeng Kang
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Yan-Ge Cui
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Huiwen Zheng
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Peina Wang
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Kang Han
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Peng Yu
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
| | - Yan-Zhong Chang
- grid.256884.50000 0004 0605 1239Ministry of Education Key Laboratory of Molecular and Cellular Biology, The Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Nan’erhuan Eastern Road, Shijiazhuang, 050024 Hebei Province China
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Zhu K, Liu C, Gao Y, Lu J, Wang D, Zhang H. Cryo-EM Structure and Activator Screening of Human Tryptophan Hydroxylase 2. Front Pharmacol 2022; 13:907437. [PMID: 36046836 PMCID: PMC9420949 DOI: 10.3389/fphar.2022.907437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 06/23/2022] [Indexed: 02/06/2023] Open
Abstract
Human tryptophan hydroxylase 2 (TPH2) is the rate-limiting enzyme in the synthesis of serotonin. Its dysfunction has been implicated in various psychiatric disorders such as depression, autism, and bipolar disorder. TPH2 is typically decreased in stability and catalytic activity in patients; thus, screening of molecules capable of binding and stabilizing the structure of TPH2 in activated conformation is desired for drug development in mental disorder treatment. Here, we solved the 3.0 Å cryo-EM structure of the TPH2 tetramer. Then, based on the structure, we conducted allosteric site prediction and small-molecule activator screening to the obtained cavity. ZINC000068568685 was successfully selected as the best candidate with highest binding affinity. To better understand the driving forces and binding stability of the complex, we performed molecular dynamics simulation, which indicates that ZINC000068568685 has great potential to stabilize the folding of the TPH2 tetramer to facilitate its activity. The research might shed light on the development of novel drugs targeting TPH2 for the treatment of psychological disorders.
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Affiliation(s)
- Kongfu Zhu
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Chao Liu
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Yuanzhu Gao
- Cryo-EM Facility Center, Southern University of Science and Technology, Shenzhen, China
| | - Jianping Lu
- Department of Child and Adolescent Psychiatry, Shenzhen Kangning Hospital, Shenzhen Mental Health Center, Shenzhen, China
| | - Daping Wang
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, China
- Department of Orthopedics, Shenzhen Intelligent Orthopaedics and Biomedical Innovation Platform, Guangdong Provincial Research Center for Artificial Intelligence and Digital Orthopedic Technology, Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- *Correspondence: Daping Wang, ; Huawei Zhang,
| | - Huawei Zhang
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, China
- Guangdong Provincial Key Laboratory of Advanced Biomaterials, Southern University of Science and Technology, Shenzhen, China
- *Correspondence: Daping Wang, ; Huawei Zhang,
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Champagne M, Horvath GA, Perreault S, Gauthier J, Hyland K, Soucy J, Mitchell GA. Intermittent neurologic decompensation: An underrecognized presentation of tyrosine hydroxylase deficiency. JIMD Rep 2022; 63:400-406. [PMID: 36101825 PMCID: PMC9458604 DOI: 10.1002/jmd2.12306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 05/15/2022] [Accepted: 05/17/2022] [Indexed: 12/04/2022] Open
Abstract
Tyrosine hydroxylase deficiency (THD) is a treatable inborn error of dopamine biosynthesis caused by mutations in TH. Two presentations are described. Type A, milder, presents after 12 months of age with progressive hypokinesis and rigidity. Type B presents before 12 months as a progressive complex encephalopathy. We report a girl with mild THD who had recurrent episodes of neurological decompensations. Before the first episode, she had normal development except for mild head tremor. Episodes occurred at 12, 19, and 25 months of age. After viral infections or vaccination, she developed lethargy, worsened tremor, language, and motor regression including severe axial hypotonia, recuperating over several weeks of intensive rehabilitation but with residual tremor and mild lower limb spasticity. Basal ganglia imaging was normal. Exome sequencing revealed two missense variants of uncertain significance in TH: c.1147G>T and c.1084G>A. Both have low gnomAD allele frequencies and in silico, are predicted to be deleterious. Cerebrospinal fluid analysis showed low homovanillic acid (HVA, 160 nmol/L, reference 233–938) and low HVA/5‐hydroxyindolacetic acid molar ratio (1.07, reference .5–3.5). She responded rapidly to L‐Dopa/carbidopa without further episodes. Literature review revealed four other THD patients who had a total of seven episodes of marked hypotonia and motor regression following infections, occurring between ages 12 months and 6 years. All improved with L‐Dopa/carbidopa treatment. Intermittent THD is treatable, important for genetic counseling, and should be considered after even a single episode of marked hypotonia with recuperation over weeks, especially in patients with preexisting tremor, dystonia, or rigidity.
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Affiliation(s)
- Marjolaine Champagne
- Division of Medical Genetics, Department of Pediatrics, Molecular Diagnostic Laboratory, Centre Hospitalier Universitaire Sainte‐Justine Université de Montréal Montréal Québec Canada
| | - Gabriella A. Horvath
- Division of Biochemical Diseases, Department of Pediatrics BC Children's Hospital Vancouver British Columbia Canada
| | - Sébastien Perreault
- Division of Child Neurology, Department of Pediatrics Centre Hospitalier Universitaire Sainte‐Justine Montréal Québec Canada
| | - Julie Gauthier
- Division of Medical Genetics, Department of Pediatrics, Molecular Diagnostic Laboratory, Centre Hospitalier Universitaire Sainte‐Justine Université de Montréal Montréal Québec Canada
- Integrated Centre for Pediatric Clinical Genomics, Centre Hospitalier Universitaire Sainte‐Justine Montréal Québec Canada
| | - Keith Hyland
- MNG Laboratories (Medical Neurogenetics, LLC.), MNG, a Wholly Owned Subsidiary of Laboratory Corporation of America Holdings San Diego California USA
| | - Jean‐François Soucy
- Division of Medical Genetics, Department of Pediatrics, Molecular Diagnostic Laboratory, Centre Hospitalier Universitaire Sainte‐Justine Université de Montréal Montréal Québec Canada
- Integrated Centre for Pediatric Clinical Genomics, Centre Hospitalier Universitaire Sainte‐Justine Montréal Québec Canada
| | - Grant A. Mitchell
- Division of Medical Genetics, Department of Pediatrics, Molecular Diagnostic Laboratory, Centre Hospitalier Universitaire Sainte‐Justine Université de Montréal Montréal Québec Canada
- Integrated Centre for Pediatric Clinical Genomics, Centre Hospitalier Universitaire Sainte‐Justine Montréal Québec Canada
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Bueno-Carrasco MT, Cuéllar J, Flydal MI, Santiago C, Kråkenes TA, Kleppe R, López-Blanco JR, Marcilla M, Teigen K, Alvira S, Chacón P, Martinez A, Valpuesta JM. Structural mechanism for tyrosine hydroxylase inhibition by dopamine and reactivation by Ser40 phosphorylation. Nat Commun 2022; 13:74. [PMID: 35013193 PMCID: PMC8748767 DOI: 10.1038/s41467-021-27657-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 12/03/2021] [Indexed: 12/15/2022] Open
Abstract
Tyrosine hydroxylase (TH) catalyzes the rate-limiting step in the biosynthesis of dopamine (DA) and other catecholamines, and its dysfunction leads to DA deficiency and parkinsonisms. Inhibition by catecholamines and reactivation by S40 phosphorylation are key regulatory mechanisms of TH activity and conformational stability. We used Cryo-EM to determine the structures of full-length human TH without and with DA, and the structure of S40 phosphorylated TH, complemented with biophysical and biochemical characterizations and molecular dynamics simulations. TH presents a tetrameric structure with dimerized regulatory domains that are separated 15 Å from the catalytic domains. Upon DA binding, a 20-residue α-helix in the flexible N-terminal tail of the regulatory domain is fixed in the active site, blocking it, while S40-phosphorylation forces its egress. The structures reveal the molecular basis of the inhibitory and stabilizing effects of DA and its counteraction by S40-phosphorylation, key regulatory mechanisms for homeostasis of DA and TH. Tyrosine hydroxylase (TH) catalyzes the rate-limiting step in the synthesis of the catecholamine neurotransmitters and hormones dopamine (DA), adrenaline and noradrenaline. Here, the authors present the cryo-EM structures of full-length human TH in the apo form and bound with DA, as well as the structure of Ser40 phosphorylated TH, and discuss the inhibitory and stabilizing effects of DA on TH and its counteraction by Ser40-phosphorylation.
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Affiliation(s)
| | - Jorge Cuéllar
- Centro Nacional de Biotecnología (CNB-CSIC), Madrid, Spain.
| | - Marte I Flydal
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - César Santiago
- Centro Nacional de Biotecnología (CNB-CSIC), Madrid, Spain
| | | | - Rune Kleppe
- Norwegian Centre for Maritime and Diving Medicine, Department of Occupational Medicine, Haukeland University Hospital, Bergen, Norway
| | | | | | - Knut Teigen
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Sara Alvira
- Centro Nacional de Biotecnología (CNB-CSIC), Madrid, Spain.,School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
| | - Pablo Chacón
- Instituto de Química Física Rocasolano (IQFR-CSIC), Madrid, Spain
| | - Aurora Martinez
- Department of Biomedicine, University of Bergen, Bergen, Norway.
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10
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Personalized Medicine to Improve Treatment of Dopa-Responsive Dystonia-A Focus on Tyrosine Hydroxylase Deficiency. J Pers Med 2021; 11:jpm11111186. [PMID: 34834538 PMCID: PMC8625014 DOI: 10.3390/jpm11111186] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/08/2021] [Accepted: 11/09/2021] [Indexed: 11/25/2022] Open
Abstract
Dopa-responsive dystonia (DRD) is a rare movement disorder associated with defective dopamine synthesis. This impairment may be due to the fact of a deficiency in GTP cyclohydrolase I (GTPCHI, GCH1 gene), sepiapterin reductase (SR), tyrosine hydroxylase (TH), or 6-pyruvoyl tetrahydrobiopterin synthase (PTPS) enzyme functions. Mutations in GCH1 are most frequent, whereas fewer cases have been reported for individual SR-, PTP synthase-, and TH deficiencies. Although termed DRD, a subset of patients responds poorly to L-DOPA. As this is regularly observed in severe cases of TH deficiency (THD), there is an urgent demand for more adequate or personalized treatment options. TH is a key enzyme that catalyzes the rate-limiting step in catecholamine biosynthesis, and THD patients often present with complex and variable phenotypes, which results in frequent misdiagnosis and lack of appropriate treatment. In this expert opinion review, we focus on THD pathophysiology and ongoing efforts to develop novel therapeutics for this rare disorder. We also describe how different modeling approaches can be used to improve genotype to phenotype predictions and to develop in silico testing of treatment strategies. We further discuss the current status of mathematical modeling of catecholamine synthesis and how such models can be used together with biochemical data to improve treatment of DRD patients.
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11
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Bushueva OO, Antipenko EA. [Update on the etiology and pathogenesis of muscle dystonia]. Zh Nevrol Psikhiatr Im S S Korsakova 2021; 121:127-133. [PMID: 34037366 DOI: 10.17116/jnevro2021121041127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Muscle dystonia is one of the most common extrapyramidal diseases and is the third most common after essential tremor and Parkinson's disease. The introduction of diagnostic methods expanded the understanding of the genetic basis of muscle dystonia and neurophysiological mechanisms of dystonic phenomena. However, the questions of the etiology and pathogenesis of dystonia still remain the subject of close interest of researchers. The review provides up-to-date information about the etiology and pathogenesis of muscle dystonia. Recent changes in the genetic nomenclature of dystonia are described. Modern ideas about the pathogenetic significance of such mechanisms as abnormalities of neural inhibition, disturbances of sensorimotor integration, and abnormalities of neural plasticity are considered. Recent research data support the concept of systemic sensorimotor disintegration, including not only basal ganglia dysfunction, but also motor network disorders involving the cerebellum, cortex, midbrain, thalamus and other areas.
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Affiliation(s)
- O O Bushueva
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia.,City Hospital N 33, Nizhny Novgorod, Russia
| | - E A Antipenko
- Privolzhsky Research Medical University, Nizhny Novgorod, Russia
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12
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Li XY, Yang YM, Li LB, Zhang MY, Huang YY, Wang J, Wang L, Wan XH. Identification of TH Variants in Chinese Dopa-Responsive Dystonia Patients and Long-Term Outcomes. Front Neurol 2021; 12:644910. [PMID: 34054692 PMCID: PMC8149779 DOI: 10.3389/fneur.2021.644910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 04/01/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Dopa-responsive dystonia (DRD) is a movement disorder that is highly clinically and genetically heterogeneous. Our study summarizes clinical characteristics and long-term outcomes in patients with dopa-responsive dystonia with the aim of obtaining further knowledge on this disorder. Methods: Patients who met DRD genetic diagnostic criteria through whole-exome sequencing and took levodopa for over 3 years were included in our study. Detailed information was collected on these patients, including family history, age at onset, age and dosage at starting levodopa, current medication and dosage, levodopa duration, diurnal fluctuation, and other clinical features. The Burke–Fahn–Marsden Dystonia Rating Scale-Motor (BFMDRS-M) score was used to evaluate patients' dystonia and variation after levodopa. According to the long-term outcomes, patients were further graded as good (dystonia improved by more than 50% after levodopa, and no further motor symptoms appeared) and poor (dystonia improved by <50% after levodopa, or new motor symptoms appeared). Results: A total of 20 DRD patients were included (11 with GCH1 variants, 9 with TH variants). During long-term levodopa treatment, three patients with TH variants (3/20, 15%) developed motor symptoms, including body jerks and paroxysmal symptoms, and responded well to increasing levodopa doses. The patient with homozygous mutation c.1481C>T/p. Thr494Met harbored more serious symptoms and poor response to levodopa and showed decreased cardiac uptake in MIBG. Conclusions: Most DRD patients showed satisfactory treatment outcomes after long-term levodopa, whereas few patients with TH variants presented motor symptoms, which is considered to be related to dopamine insufficiency. For patients with motor symptoms after long-term levodopa, increasing the dose slowly might be helpful to relieve symptoms.
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Affiliation(s)
- Xin-Yao Li
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Ying-Mai Yang
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Li-Bo Li
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Meng-Yu Zhang
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Yang-Yu Huang
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Jie Wang
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Lin Wang
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Xin-Hua Wan
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
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13
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Alrashidi H, Eaton S, Heales S. Biochemical characterization of proliferative and differentiated SH-SY5Y cell line as a model for Parkinson's disease. Neurochem Int 2021; 145:105009. [PMID: 33684546 DOI: 10.1016/j.neuint.2021.105009] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 02/24/2021] [Accepted: 03/01/2021] [Indexed: 12/13/2022]
Abstract
Parkinson's disease is a multifactorial neurodegenerative disease. The cellular pathology includes dopamine depletion, decrease in mitochondrial complex I enzyme activity, lysosomal glucocerebrosidase enzyme activity and glutathione levels. The SH-SY5Y human neuroblastoma cell line is one of the most widely used cell line models for Parkinson's disease. However, the consensus on its suitability as a model in its proliferative or differentiated state is lacking. In this study, we characterized and compared the biochemical processes most often studied in PD. This in proliferative and differentiated phenotypes of SH-SY5Y cells and several differences were found. Most notably, extracellular dopamine metabolism was significantly higher in differentiated SH-SY5Y. Furthermore, there was a greater variability in glutathione levels in proliferative phenotype (+/- 49%) compared to differentiated (+/- 16%). Finally, enzyme activity assay revealed significant increase in the lysosomal enzyme glucocerebrosidase activity in differentiated phenotype. In contrast, our study has found similarities between the two phenotypes in mitochondrial electron transport chain activity and tyrosine hydroxylase protein expression. The results of this study demonstrate that despite coming from the same cell line, these cells possess some key differences in their biochemistry. This highlights the importance of careful characterization of relevant disease pathways to assess the suitability of cell lines, such as SH-SY5Y cells, for modelling PD or other diseases, i.e. when using the same cell line but different differentiation states.
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Affiliation(s)
- Haya Alrashidi
- Genetics and Genomic Medicine, GOS Institute of Child Health, University College London, London, UK; Biochemistry Division, Faculty of Science, Kuwait University, Kuwait
| | - Simon Eaton
- Development Biology and Cancer, GOS Institute of Child Health, University College London, London, UK.
| | - Simon Heales
- Genetics and Genomic Medicine, GOS Institute of Child Health, University College London, London, UK; Neurometabolic Unit, National Hospital for Neurology and Neurosurgery, Queen Square, London, UK.
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14
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Discovery and biological characterization of a novel scaffold for potent inhibitors of peripheral serotonin synthesis. Future Med Chem 2020; 12:1461-1474. [DOI: 10.4155/fmc-2020-0127] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Aim: Tryptophan hydroxylase 1 (TPH1) catalyzes serotonin synthesis in peripheral tissues. Selective TPH1 inhibitors may be useful for treating disorders related to serotonin dysregulation. Results & methodology: Screening using a thermal shift assay for TPH1 binders yielded Compound 1 (2-(4-methylphenyl)-1,2-benzisothiazol-3(2 H)-one), which showed high potency (50% inhibition at 98 ± 30 nM) and selectivity for inhibiting TPH over related aromatic amino acid hydroxylases in enzyme activity assays. Structure–activity relationships studies revealed several analogs of 1 showing comparable potency. Kinetic studies suggested a noncompetitive mode of action of 1, with regards to tryptophan and tetrahydrobiopterin. Computational docking studies and live cell assays were also performed. Conclusion: This TPH1 inhibitor scaffold may be useful for developing new therapeutics for treating elevated peripheral serotonin.
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15
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Barone H, Bliksrud YT, Elgen IB, Szigetvari PD, Kleppe R, Ghorbani S, Hansen EV, Haavik J. Tyrosinemia Type 1 and symptoms of ADHD: Biochemical mechanisms and implications for treatment and prognosis. Am J Med Genet B Neuropsychiatr Genet 2020; 183:95-105. [PMID: 31633311 DOI: 10.1002/ajmg.b.32764] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/25/2019] [Accepted: 09/17/2019] [Indexed: 12/20/2022]
Abstract
Hereditary tyrosinemia Type 1 (HT-1) is a rare metabolic disease where the enzyme catalyzing the final step of tyrosine breakdown is defect, leading to accumulation of toxic metabolites. Nitisinone inhibits the degradation of tyrosine and thereby the production of harmful metabolites, however, the concentration of tyrosine also increases. We investigated the relationship between plasma tyrosine concentrations and cognitive functions and how tyrosine levels affected enzyme activities of human tyrosine hydroxylase (TH) and tryptophan hydroxylase 2 (TPH2). Eight Norwegian children between 6 and 18 years with HT-1 were assessed using questionnaires measuring Attention Deficit Hyperactivity Disorder (ADHD)-symptoms and executive functioning. Recent and past levels of tyrosine were measured and the enzyme activities of TH and TPH2 were studied at conditions replicating normal and pathological tyrosine concentrations. We observed a significant positive correlation between mean tyrosine levels and inattention symptoms. While TH exhibited prominent substrate inhibition kinetics, TPH2 activity also decreased at elevated tyrosine levels. Inhibition of both enzymes may impair syntheses of dopamine, noradrenaline, and serotonin in brain tissue. Inattention in treated HT-1 patients may be related to decreased production of these monoamines. Our results support recommendations of strict guidelines on plasma tyrosine levels in HT-1. ADHD-related deficits, particularly inattention, should be monitored in HT-1 patients to determine whether intervention is necessary.
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Affiliation(s)
- Helene Barone
- Department of Child and Adolescent Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Yngve T Bliksrud
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Irene B Elgen
- Department of Child and Adolescent Psychiatry, Haukeland University Hospital, Bergen, Norway
| | | | - Rune Kleppe
- Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Sadaf Ghorbani
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Eirik V Hansen
- Department of Pediatrics, Haukeland University Hospital, Bergen, Norway
| | - Jan Haavik
- Department of Biomedicine, University of Bergen, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
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16
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Can the Executive Control Network be Used to Diagnose Parkinson's Disease and as an Efficacy Indicator of Deep Brain Stimulation? PARKINSONS DISEASE 2020; 2020:6348102. [PMID: 32148755 PMCID: PMC7042555 DOI: 10.1155/2020/6348102] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 01/07/2020] [Accepted: 01/17/2020] [Indexed: 01/19/2023]
Abstract
Objective The aim of this work was to investigate whether there are differences in the executive control network (ECN) between patients with Parkinson's disease (PD) before and after deep brain stimulation (DBS) surgery and to explore how deep brain stimulation (DBS) surgery affects ECN connectivity in patients with PD. Methods Resting-state magnetic resonance imaging (MRI) data were obtained from 23 patients with Parkinson's disease preoperatively (pre-PD) and postoperatively (post-PD) and 14 normal controls (CN). The right dorsolateral prefrontal cortex (DLPFC) was used as the seed region of interest (ROI) to study the characteristics of the functional connectivity of the ECN in these subjects. Results There were differences in the ECN among PD patients before and after surgery and between the CN. Compared with the CN group, the pre-PD patients showed significantly reduced functional connectivity (FC) between the DLPFC and the left inferior frontal gyrus, left precuneus, left cerebellum posterior lobe, right middle frontal gyrus, right inferior parietal gyrus, right posterior central gyrus, right precuneus, and right inferior frontal gyrus. Compared to the CN group, the post-PD patients showed significantly reduced FC between the DLPFC and left inferior frontal gyrus, left precuneus, left cerebellum posterior lobe, right middle frontal gyrus, right inferior frontal gyrus, and right parietal lobule. There is no difference in the ECN between the pre-PD patients and the post-PD patients. Conclusions The FC of ECN in PD patients was different from that in normal controls, but the FC of the ECN in patients with PD may not be altered by DBS. This suggests that the ECN may be considered an imaging biomarker for the identification of PD but may not be a good imaging biomarker for the evaluation of DBS efficacy.
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17
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Hou M, Yang C, Hu J, Guo Y, Liu P, Liu Y, Song J, Wei W, Chen Z. Levodopa is effective in the treatment of three Chinese Tyrosine hydroxylase (TH) deficiency children. Int J Dev Neurosci 2019; 78:28-32. [PMID: 31419477 DOI: 10.1016/j.ijdevneu.2019.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 08/07/2019] [Accepted: 08/11/2019] [Indexed: 10/26/2022] Open
Abstract
Tyrosine hydroxylase (TH) deficiency is a rare autosomal recessive inborn error of dopamine transmission, which the deficient gene is at the chromosome 11, also called'Segawa Syndrome'. TH converts tyrosine into L-DOPA, which is the direct precursor of catecholamine biosynthesis. TH deficiency causes a neurological disease with primary extrapyramidal signs and a variable response to L-DOPA. We report three patients in China who were diagnosed with Tyrosine hydroxylase (TH) deficiency by genetic testing and clinical manifestations. After L-DOPA treatment, their condition had sustained improvement.
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Affiliation(s)
- Mei Hou
- Pediatric Department of the Qingdao Women & Children Hospital, No. 6 Tongfu Road, Shandong, 266000, PR China
| | - Chengqing Yang
- Pediatric Department of the Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shandong, 266000, PR China
| | - Jingfei Hu
- Pediatric Department of the Qingdao Women & Children Hospital, No. 6 Tongfu Road, Shandong, 266000, PR China
| | - Ya Guo
- Pediatric Department of the Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shandong, 266000, PR China
| | - Peipei Liu
- Pediatric Department of the Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shandong, 266000, PR China
| | - Yedan Liu
- Pediatric Department of the Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shandong, 266000, PR China
| | - Jie Song
- Pediatric Department of the Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shandong, 266000, PR China
| | - Wei Wei
- Kangso Medical Inspection Co., Ltd, No. 65 Haidian District, Xingshikou Road Yiyuan Cultural Creative Industry Base C District No. 10, Floor 2, 201-203, Beijing, 100195, PR China
| | - Zongbo Chen
- Pediatric Department of the Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shandong, 266000, PR China
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18
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Beaver SK, Mesa-Torres N, Pey AL, Timson DJ. NQO1: A target for the treatment of cancer and neurological diseases, and a model to understand loss of function disease mechanisms. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:663-676. [PMID: 31091472 DOI: 10.1016/j.bbapap.2019.05.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 05/07/2019] [Accepted: 05/09/2019] [Indexed: 01/08/2023]
Abstract
NAD(P)H quinone oxidoreductase 1 (NQO1) is a multi-functional protein that catalyses the reduction of quinones (and other molecules), thus playing roles in xenobiotic detoxification and redox balance, and also has roles in stabilising apoptosis regulators such as p53. The structure and enzymology of NQO1 is well-characterised, showing a substituted enzyme mechanism in which NAD(P)H binds first and reduces an FAD cofactor in the active site, assisted by a charge relay system involving Tyr-155 and His-161. Protein dynamics play important role in physio-pathological aspects of this protein. NQO1 is a good target to treat cancer due to its overexpression in cancer cells. A polymorphic form of NQO1 (p.P187S) is associated with increased cancer risk and certain neurological disorders (such as multiple sclerosis and Alzheimer´s disease), possibly due to its roles in the antioxidant defence. p.P187S has greatly reduced FAD affinity and stability, due to destabilization of the flavin binding site and the C-terminal domain, which leading to reduced activity and enhanced degradation. Suppressor mutations partially restore the activity of p.P187S by local stabilization of these regions, and showing long-range allosteric communication within the protein. Consequently, the correction of NQO1 misfolding by pharmacological chaperones is a viable strategy, which may be useful to treat cancer and some neurological conditions, targeting structural spots linked to specific disease-mechanisms. Thus, NQO1 emerges as a good model to investigate loss of function mechanisms in genetic diseases as well as to improve strategies to discriminate between neutral and pathogenic variants in genome-wide sequencing studies.
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Affiliation(s)
- Sarah K Beaver
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Huxley Building, Lewes Road, Brighton BN2 4GJ, UK
| | - Noel Mesa-Torres
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain
| | - Angel L Pey
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain.
| | - David J Timson
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Huxley Building, Lewes Road, Brighton BN2 4GJ, UK.
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